Furnace



Feb. 13, 1923. I 1,445,220

c. L. LEE

FURNACE Filed July 14, 1920 2 sheets-sheet 1 by??? Q &7 I JWQ Patented Fee; is, 'ieaia I UNHTED STATES iaeaaae aras-r QFFHCE;

GHARIlLES L. LEE, OF DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH 4 CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

FURNl-LCIE.

Application filed July 14,

Y '0 all whom it may concern:

citizen of the United States of America, re- I siding at Dayton, county of Montgomery, 5 and State of Ohio, have invented certain new and useful vImprovements in Furnaces, of which the following is a full, clear, and exact description.

The present invention relates to furnaces for special work and in its preferred form of embodiment to a furnace for carrying out a process of attaching cooling fins to internal-combustion engine cylinders, which form of embodiment of the invention has been chosen as a convenient form for the purpose of description and explanation. I

Among the objects of the invention is the provision of a furnace which will allow the application of the required heat to thework without allowing access thereto of harmful gases, for example,products of combustion when the heating element is, a hydrocarbon burner.

Another object is the provision of a fur- -nace which will substantially prevent the deleterious action of the outside air upon the work. a v Further objects of the invention include the arrangement of the furnace so that the 0 heat is applied to one portion of the work, and by conduction carried to that portion where it is to be utilized for the accomplishing of the desired result. In the preferred form, that is, in a fin attaching furnace, the

I heat is applied to the inside of a cylinder,

say of ferrous metal, then carried by conduction to the outside of the cylinder to the plane of attachment of the fins, which may be of non-ferrous metal easilyaffected by on the air or by hydrocarbon gases ortheir products of combustion, .but which in the present invention are, as. above indicated, sufficiently protected from the action of such gases and air.

present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein the preferred embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 shows a side elevation of the furnace assembly with the furnace itself in section along line 11 of Fig. 2, and also shows Further objects and advantages of the 1920. Serial No. 396,276. a. i

the accessory apparatus, illustrated diagrammatically;

Fig. 2 is an end View of the furnace from the right of Fig. 1 with a section, of the furnace casing along the line 2-2 'of Fig. 1, certain of the accessory apparatushaving been omitted; and

Fig. 3 is a perspective view of a cylinderfin assembly ready to be bolted to the para tition plate and inserted in the furnace.

As will be readily seen, the furnace as sembly comprises a base 10 upon which, on suitable, pedestals, are mounted rollers 11,

carrying thefurnace casing, a motor 12 and a burner, designated as a whole by the numeral 13. Also mounted upon the base 1-0, is a suitable worm drive reducing gear 14 which. is driven by themotor 12 androtates the rollers 11 upon which the furnace casin rests.

'ltefer'ring more particularly to Fig. 1, it will be seen that the furnace, proper con sists of an 'outerjmetal drum or casing 20 lined with aheat insulating material 21 and provided on its periphery with the bearing rings 22 adapted to rest upon and cooperate with the rollers 11, being rotated thereby,

This drum 20 is provided atone end with a fixed closure late 23 which has a central opening 24 and which has around it, inside of the furnace, the sleeve 25. This sleeve is attached to the closure plate 23 by means of suitable bolts or screws and has its inner end so shaped as to permit making a subvstantially gas tight joint with the open end of an engine. cylinder. The other end of this drum 20 is provided with a detachable cover or closure 26 which may be hinged as shown in the drawings or maybe secured to the end of the drum by any other suitable.

easily detachable means such as a plurality of bolts like the one indicated at 27. This closure plate 26 is also provided with a central spring pressed plunger indicated by the I numeral 28, the purpose of which will be indicated later, and a peepliole 29.

In order to provide means for escape of any products of combustion or unburned gases from the casing without their having in the opposite 'end, closure member 23 is preferably also provided with a series of 1 to pass over the fins and through openings 1 escape of gases, these openings 24 also tend to equalize the temperature of the ends of the cylinder under treatment, thus producing a more uniform attachment of the fins.

Mounted also upon the base 10 as indicated is a burner designated as a whole by the numeral 13 and so positioned as to be opposite the central opening 24 in the closure plate 23. This burner is, .as shown, preferably of the Good type and consists of an air chamber 30, a combustion chamber 31, communlcating by means of suitable perforations with the air chamber, and supplied with ignition means, such as the spark plug 32. Communicating with the combustion chamber, and forming in effect an extension thereof, is a tube or pipe 33 which is of sufficient length to project some distance through the opening 24 and into the furnace. Surrounding said pipe 33 and spaced therefrom is another tube or pipe 34 which also communicates withthe interior of the pressure is delivered to the end of chamber 30 opposite the rear, end wall of the combustion chamber 31. This end wall is provided with a small passage 38 which leads a jet of air directly across the end of thefuel jet 37, thus atomizing the liquid fuel into the combustion chamber when it is mixed with additional air from the perforations in the walls of chamber 31 communicating with chamber 30, to form a suitable combustible mixture.

Also mounted on the base 10, as has already been indicated is a motor 12. The shaft of-this motor is attached through suitable couplings to the worm 40 of the worm drive designated'as a whole by the numeral 14. This worm 4O drives the corresponding gear 41, which is keyed to an extension of Shaft 42 carrying rollers 11.

The accessory apparatus, shown diagrammatically, comprises a suitable source of current, shown conventionally at 50, and controlled by switch 51, for supplying current to the motor 12-. It also comprises a spark coil 52, the primary winding of which is supplied with current from a battery 53, and the secondary winding of which is connected at one end with the spark plug 32 and at the other end with a ground. The battery circuit through the primary winding may be controlled by a suitable switch as indicated by numeral 54. This accessory apparatus also includes suitable sources of fuel and compressed air controlled respectively by the valves 55 and 56.

In operating the furnace, a cylinder 60 is first assembled with the fin material 7 0 suitably foldedor crimped as indicated in Fig. 3, by placing the fin material around the cylinder with a sheet of brazing brass interposed and the whole bound together with wires 71. Two of these wires have been illustratedbut usually more are used. After the addition thereto of suitable fluxes, the plate 61 is attached by means of bolts 62 extending through the valve ports. This plate 61 is of such size that it fits snugly within the furnace and acts as a partition therein to prevent too free circulation of air around the fins and also serves to center the cylinder. Plate 61 is also provided with openings 64 which permit observation of the heating through the peepliole 29.

When the cylinder and plate have been placed within the furnace, the closure plate 26 is secured in place and when this is done, the mounted plunger rod 28 carrying a foot piece 63 presses against the ends of the bolts 62 and so holds the cylinder firmly in place and centered within the furnace, while permitting the cylinder to expand longitudinally.

When the cylinder has been properly positioned within the furnace and the end plate 26 closed, the current is turned on the motor 12 by closing switch 51, the fuel and air are supplied to the burner and the switch 00 54, controlling the current to the spark plug, is closed. The furnace will thus be rotated and the cylinder heated by'means of the burner.

Tl e regulation of thetemperature in the furnace depends, of course, upon the metal being treated and may be readily accomplished by regulating the air and fuel supply and time.of heating.

The electric motor and the Good burner, shown as parts of the device chosen for specific description, have been found convenient and satisfactory means for the rotating and heating, but other suitable. means for accomplishing the rotating and heating may be substituted therefor without departing from the invention. Y

While the form of mechanism herein shown and described constitutes a preferred form of embodiment of the invention, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

;1. A furnace of the character described, comprising a casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering and securing the work piece within said casing and over said opening, a closure for the other .end of said casing, and means 130 other end of said casing, means for supplyfor supplying a heating medium through said opening to and within the work piece.

2. A furnace of the character described, comprising a rotatable casing, closure means for one end. thereof, the closure means being provided with a central opening, means for centering a cylinder within said casing and over said opening, a closure for the ing a heating medium through said opening to and within the cylinder, and means for rotating the casing.

3. A furnace of the character described, comprising a casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering and securing a cylinder within said casing and over said opening, a closure for the other end of said casing, means for supplying a heating medium-through said opening to and within the cylinder, and means for preventing free access of gases to and circulation w1thin. said casing around the cylinder.

4. A furnace of the character described, comprising av rotatable casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering a cylinder within said casing and over said opening, a closure for the other end of said casing, means for supplying a heating medium through said opening to and within the cylinder, means for preventing free access of gases to and circulation within said casing around the cylinder, and means for rotating the casing. 5. A furnace of the character described, comprising a heat insulated casing, closure means for one end thereof, the closure. means being provided with a central opening, means for centering and securing a cylinder within said casing and over saidopening, a

- closure for the other end of said casing,

means for supplying a heating medium through said opening to and within the cylinder and means for preventing access of said medium to the exterior of said cylinder.

6. A furnace of the character described, comprising a heat insulated casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering and securing a cylinder within said casing and over said opening, a closure for the otherend of said casing, means for supplying a heating medium through said opening to and within the cylinder, and means for preventing free access of gases to and circulation within said casing around the cylinder 7, A furnace of the character described,

comprising a rotatable heat insulated casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering a cylinder within said casing and over said 0pening, a closure for the other end of said casing, means for supplying a heating medium through said opening to and within the cylinder, means for preventing free access of gases to and circulation within said casing around said cylinder, and means for rot-at ing the casing;

8. A furnace of the character described, comprising a casing, closure means for one end thereof, the closure means being provided with a central opening, means for centering a cylinder within said casing so as to form a substantially gas tight closure for said opening but permitting free access to the interior of the cylinder, a closure for the other end of said casing, and means for supplying a heating medium through said opening to and within the cylinder.

9. A furnace of the character described,

comprising a casing, closure means for one end thereof, the closure means being pro vided with a central opening, means for centering a cylinder within said casing so as to form a substantially gas tight closure ,for said opening but permitting free access sure for said opening but permitting free access to the interior of the cylinder, a closure for the other end of said casing, means for supplying a heating medium through said opening to and within the cylinder, means for preventing free access of gases to and circulation. within said casing around the cylinder, and means for rotating the casing.

11. A furnace of the character described, comprising a casing, closure means for one end thereof,'t'he closure means being provided with a central opening, means for centering and securing a cylinder within said casing and over said opening, a hydrocarbon burner positioned so as to direct a heating flame through said opening to and within the cylinder and means for leading off combustion products without their having access to the outside of the said cylinder.

12. A furnace of the character described, comprising a casing, closuremeans for one end thereof, the closure means being provided with a central opening, means for centering and securing a cylinder within said casing and over said opening, a hydrocarbon burner positioned so as to direct a heating flame through said open ng to and within the cylinder, and means for preventing free access of gases to and circulation Within said casing around the cylinder.

13. Afurnace of the character described, comprising a casing, closure means for one end thereof, the closure means being provided With a central opening, means for centering and securing a cylinder within said casing and oversaid opening, a hydrocarbon burner positioned so as to direct a heating flame through said opening to and Within the cylinder, means for substantially preventing access of hydrocarbons and products of combustion to the outer side of the cylinder.

14. A furnace of the character described,

. comprising a casing, fixed closure means for one end thereof, the closure means being provided With a central opening, means for centering and securing a cylinder within.

said casing and over said opening, a closure for the other end of said casing, means for supplying a heating medium through said opening to and within the cylinder and means for preventing access of said medium to the exterior of said cylinder.

15. A furnace of the character described, comprising a rotatable casing, fixed closure means for one end thereof, the closure means being provided with a central opening,

means for centering a cylinder Within said casing and over said opening, a closure for the other end of said casing, means for supplying a heatin medium through said opening to and within the cylinder, and means for rotating the casing.

16. A furnace of the character described, comprising a rotatable casing, .fixed closure means for one end thereof, the closure means being provided with a central opening, means for centering a cylinder within said casing and over said opening,a closure for signature.

theother, end of said casing, means for supplylng a heating medium through said opening to and within the cylinder, means for preventing free access of gases to and circulation Within said casing around the cyllnder, and means for rotating the casing.

17. A furnace of the character described,

comprising a heat insulated casing, means for retaining a cylinder therein in position, means for directing a heating medium against the interior of said cylinder, and

means for preventing contact of harmful gases with the outside of the said cylinder.

18. A furnace of the character described, comprising a heat insulated casing, means for retaining a cylinder therein in position, a burner'for directing a heating flame into said cylinder and means for preventing con- 20. A furnace of the character described comprising a rotatable heat insulated casing; means for positioning a hollow workpiece therein, a hydrocarbon burner; and means for directing the flame from the burner against the interior of the Work piece.

21-. A furnace of the character described comprising a rotatable heat insulated casing; means for positioning a hollow workpiece therein, a hydrocarbon burner; means for directing the flame from the burner against the interior-of the work-piece; and means for protecting the outside of the work-piece from combustion products.

In testimony whereof ll hereto aflix my onaaiuns L. EE.

44. (A r a 

